Serotonin Catabolism 1

The video explores serotonin's synthesis, roles, and catabolic pathways. It details the mechanisms of serotonin metabolism, including hydroxylation, sulfation, and glucuronidation, which increase molecule polarity for excretion. The video also covers serotonin oxidation to aldehyde and carboxylate, and non-enzymatic reactions, emphasizing the importance of these processes in terminating serotonin's biological activity.

What is the primary role of serotonin in the brain?

• Enhancing mood and sleep

• Increasing heart rate

• Regulating blood pressure

• Controlling appetite

Which enzyme family is primarily responsible for increasing the polarity of serotonin?

• Protease

• Lipase

• Amylase

• Cytochrome P-450

What is the universal sulfate donor used in the sulfation of serotonin?

• ATP

• NADPH

• PAPS

• GTP

Which enzyme specifically catalyzes the sulfation of serotonin?

• Sulfotransferase 1B1

• Sulfotransferase 1A1

• Sulfotransferase 1A3

• Sulfotransferase 1A2

What is the initial product formed when serotonin is oxidized by monoamine oxidase?

• Serotonin glucuronide

• Hydroxy indole acetaldehyde

• Serotonin sulfate

• 5-hydroxy tryptophan

Which enzyme is responsible for the oxidation of serotonin into an aldehyde?

• Glucuronyl transferase

• Sulfotransferase

• Cytochrome P-450

• Monoamine oxidase A

What is the fate of hydroxy indole acetaldehyde in serotonin catabolism?

• It is excreted unchanged

• It is reduced to serotonin

• It is oxidized to 5-hydroxy indole acetate

• It is converted to serotonin sulfate

What type of reaction is the conversion of hydroxy indole acetaldehyde to 5-hydroxy tryptophan?

• Non-enzymatic

• Enzymatic

• Photolytic

• Hydrolytic

Which molecule is used as a reducing agent in the conversion of hydroxy indole acetaldehyde to 5-hydroxy tryptophan?

• NADH

• NADPH

• FADH2

• ATP

What is the significance of increasing the polarity of serotonin metabolites?

• To enhance their activity

• To convert them back to serotonin

• To facilitate their excretion

• To store them in the liver